WASHINGTON — More graffiti has popped up locally and as far away as Boston that appears similar to the cryptic messages scrawled in permanent marker on four monuments on the National Mall.

The graffiti, which seems to reference conspiracy theories, include the words “Jackie shot JFK” like one of the markings left on the Lincoln Memorial.

Sgt. Anna Rose with U.S. Park Police confirmed that other, similar graffiti has been found in several places in Downtown D.C.

Vandals left similar writings on a utility box on 15th Street, another utility box near Roosevelt Island, and on a stop sign near the Sylvan Theater, which lies on the grounds of the Washington Monument, said Mike Litterst, spokesman for the National Park Service.

A WTOP listener vacationing in Boston over Presidents Day said he spotted what looked like the same graffiti on a mailbox there.

Litterst said investigators were already aware of graffiti left on a utility pole in Boston that was shared on Twitter on Jan. 26.

https://twitter.com/notoriousJOC/status/824761739615023107

Other Twitter users replied that they had seen the same thing in other parts of Boston.

Rose said her department has been in touch with Boston police about several leads, and that the investigation is ongoing.

The Lincoln Memorial, the Washington Monument, the World War II Memorial and the D.C. War Memorial were each found defaced over the Presidents Day weekend. Workers began removing the graffiti on Tuesday.